Publications de Jan Cornelius Brauer

Optical gap and fundamental gap of oligoynes and carbyne

Jan Cornelius Brauer, Laurent Alexis Clément Vannay, Anne-Clémence Corminboeuf, Holger Frauenrath, Stephen Schrettl, Emmanuel Romaric Contal, Eric Albert Georges Bremond

The optoelectronic properties of various carbon allotropes and nanomaterials have been well established, while the purely sp-hybridized carbyne remains synthetically inaccessible. Its properties have therefore frequently been extrapolated from those of def ...

Nature Research2020

Unusually Long-Lived Photocharges in Helical Organic Semiconductor Nanostructures

Andrzej Sienkiewicz, Jürgen Brugger, Jan Cornelius Brauer, Valentin Flauraud, Holger Frauenrath, Liangfei Tian, Regina Judith Hafner, Thomas Schmaltz

Photocharge generation and formation of long-lived charge carriers are relevant in photosynthesis, photocatalysis, photovoltaics, and organic electronics. A better understanding of the factors that determine these processes in synthetic polymer semiconduct ...

AMER CHEMICAL SOC2018

Charge separation and carrier dynamics in donor-acceptor heterojunction photovoltaic systems

Jacques-Edouard Moser, Majed Chergui, Joël Teuscher, Jean-Pierre Wolf, Ursula Röthlisberger, Jan Cornelius Brauer, Alicia Solano, Natalie Renuka Banerji, Ariadni Boziki

Electron transfer and subsequent charge separation across donor-acceptor heterojunctions remain the most important areas of study in the field of third-generation photovoltaics. In this context, it is particularly important to unravel the dynamics of indiv ...

2017

The Fate of Electron–Hole Pairs in Polymer:Fullerene Blends for Organic Photovoltaics

Jacques-Edouard Moser, Natalie Stingelin, Jan Cornelius Brauer, Jelissa Risse, Mariateresa Scarongella, Natalie Renuka Banerji, Martina Causa'

There has been long-standing debate on how free charges are generated in donor:acceptor blends that are used in organic solar cells, and which are generally comprised of a complex phase morphology, where intermixed and neat phases of the donor and acceptor ...

Nature Publishing Group2016

Charge Transfer Dynamics from Organometal Halide Perovskite to Polymeric Hole Transport Materials in Hybrid Solar Cells

Mohammad Khaja Nazeeruddin, Jan Cornelius Brauer, Natalie Renuka Banerji, Yonghui Lee

Organometal halide perovskites have emerged as promising next-generation solar cell technologies presenting outstanding efficiencies. However, many questions concerning their working principles remain to be answered. Here, we present a detailed study of ho ...

Amer Chemical Soc2015

Dynamics of Interfacial Charge Transfer States and Carriers Separation in Dye-Sensitized Solar Cells: A Time-Resolved Terahertz Spectroscopy Study

Jacques-Edouard Moser, Jan Cornelius Brauer, Arianna Marchioro, Ahmad Ajdar Zadeh Oskouei, Arun Aby Paraecattil

Electron injection from a photoexcited molecular sensitizer into a wide-bandgap semiconductor is the primary step toward charge separation in dye-sensitized solar cells (DSSCs). According to the current understanding of DSSCs functioning mechanism, charges ...

American Chemical Society2015

Charge generation in organic solar cell materials studied by terahertz spectroscopy

Jan Cornelius Brauer, Mariateresa Scarongella, Natalie Renuka Banerji

We have investigated the photophysics in neat films of conjugated polymer PBDTTPD and its blend with PCBM using terahertz time-domain spectroscopy. This material has very high efficiency when used in organic solar cells. We were able to identify a THz sign ...

Spie-Int Soc Optical Engineering2015

Solubility and Crystallizability: Facile Access to Functionalized pi-Conjugated Compounds with Chlorendylimide Protecting Groups

Rosario Scopelliti, Stéphane Suarez, Jan Cornelius Brauer, Holger Frauenrath, Damien Rolland, Roman Niklaus Marty, Jan Gebers, Luca Cervini

Functional pi-conjugated molecules are relevant for the preparation of new organic electronic materials with improved performance. However, their synthesis is often rendered difficult by their inherently low solubility, and the permanent attachment of solu ...

Wiley-V C H Verlag Gmbh2015

Synthesis and Characterization of High-Photoactivity Electrodeposited Cu2O solar absorber by photoelectrochemistry and ultrafast spectroscopy

Michael Graetzel, Jacques-Edouard Moser, Jan Cornelius Brauer, Adriana Paracchino

We present a systematic study on the effects of electrodeposition parameters on the photoelectrochemical properties of Cu2O. The influence of deposition variables (temperature, pH, and deposition current density) on conductivity has been widely explored in ...

2012

Conduction Through Viscoelastic Phase in a Redox-Active Ionic Liquid at Reduced Temperatures

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Jan Cornelius Brauer, Verner Thorsmolle

The phase diagram of the redox active ionic liquid 1-methyl-3-propylimidazolium iodide (PMII) is examined as a function of temperature and iodine concentration. Beyond a threshold concentration of 3.9 M, the formation of higher polyiodides gives rise to a ...

Wiley2012

Temperature-Dependent Ordering Phenomena of a Polyiodide System in a Redox-Active Ionic Liquid

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Jan Cornelius Brauer, Verner Thorsmolle

Iodine added to iodide-based ionic liquids leads to dramatic changes of their physical properties which may have implications for technological applications. Here we study the phase diagram of 1-methyl 3-propylimidazolium iodide, the temperature versus iod ...

2012

Linear and Time-Resolved THz Spectroscopy of Photonic and Charge Transporting Systems

Jan Cornelius Brauer

Photo-induced charge separation and charge transport are fundamental processes in many energy conversion techniques, where light is converted into chemical energy (PEC), into electrical energy (solar cells) or in the opposite sense if electrical energy is ...

EPFL2012

Photoinduced interfacial electron transfer and lateral charge transport in molecular donor–acceptor photovoltaic systems

Jacques-Edouard Moser, Jan Cornelius Brauer, Arianna Marchioro, Jelissa Risse, Elham Ghadiri, Angela Punzi

Nanostructured liquid|solid and solid|solid bulk heterojunctions designed for the conversion of solar energy offer ideal models for the investigation of light-induced ET dynamics at surfaces. Despite significant study of processes leading to charge generat ...

2011

Dynamics and mechanisms of interfacial photoinduced electron transfer processes of third generation photovoltaics and photocatalysis

Jacques-Edouard Moser, Joël Teuscher, Christophe Bauer, Jan Cornelius Brauer, Arianna Marchioro, Jelissa Risse, Elham Ghadiri, Angela Punzi, Mateusz Barnaba Wielopolski, Natalie Renuka Banerji

Photoinduced electron transfer (PET) across molecular/bulk interfaces has gained attention only recently and is still poorly understood. These interfaces offer an excellent case study, pertinent to a variety of photovoltaic systems, photo- and electrochemi ...

2011

Transient photoconductivity of dye-sensitized TiO2 nanocrystalline films probed by optical pump-THz probe spectroscopy

Jacques-Edouard Moser, Jan Cornelius Brauer

Oxford University Press2011

Extraordinarily efficient conduction in a redox-active ionic liquid

Michael Graetzel, Jacques-Edouard Moser, Guido Rothenberger, Shaik Mohammed Zakeeruddin, Jan Cornelius Brauer, Verner Thorsmolle

Iodine added to iodide-based ionic liquids leads to extraordi- narily efficient charge transport, vastly exceeding that expect- ed for such viscous systems. Using terahertz time-domain spectroscopy, in conjunction with dc conductivity, diffusivity and visc ...

Wiley-Blackwell2011

Terahertz Time-Domain Spectroscopy Study of the Conductivity of Hole-Transporting Materials

Jacques-Edouard Moser, Jan Cornelius Brauer, Verner Thorsmolle

Some redox-active ionic liquids, organic amorphous solids containing electron-donating moieties, and conductive polymers can efficiently transport positive electrical charges. These hole-conducting media find increasing applications in unconventional solar ...

Schweizerische Chemische Gesellschaft2009